morrison



2 Sheets--Sheet T.

i. B. MORRISDN.

Adjustable Brackets.

Paten`ted August 26,1873.

J7@ 5&7@ Zanmm va. M.

2 Sheets-Shee 2.

Adjustable Brackets.

B. MORRISON.

Patented August 26, 1873.

J7@ vez@ Zan 77a' Zn ehren JAMES B. MORRISON, OF BROOKLYN, E. D., NEWYORK.

IMPROVEMENT IN ADJUSTABLE BRACKETS.

Specification forming part of Letters Patent No. 142,263, dated August26, 1873; application filed August 20, 1873.

To all whom it may concern:

Be it known that I, JAMEs B. MoRnrsoN, of the city of Brooklyn, E. D.,in the county of Kings and State of New York, have invented certain newand useful Improvements in Adjustable Brackets; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the accompanying drawings, which form a part ofthisi specification.

The object of :my present invention is to produce a simple, strong, andornamental bracket, which shall possess the capability of being swung tothe right or left, of being adjusted to any required altitude, and ofbeing eX- general. This invention consists in the combination, with aswinging or stationary back plate, of two supporting-arms, one or bothof which is provided with a curved slot, through which passes a pin forlocking the said arms together, so as to cause them to remain at therequired altitude. It also consists in providing such. back plate withan outwardly-extended portion, having a curved or arc-like slot in itfor receiving the same pin which locks the arms together, whereby muchadditional strength is given to the device. `It also consists in thecombination, with such back plate and arms, of a sliding bar, wherebythe length of the bracket may be increased or decreased, provision beingmade for constructing said sliding bar in such manner that it may becaused to serve as a reservoir for containing liquid for supplying anattached wick-tube, or as aduct for conveying gas to an attached burner.It also consists in so connecting the said sliding bar to the said'supporting-arms that the bar may have, in additionto its extensiblefeature, the capability of being revolved or swung round to the right orleft, in whichcase the back plate of the bracket could be stationary, ifso desired.

In the accompanying drawings, Figure l is a side elevation, partly insection, of my improved bracket, showing the supporting-arms in twopositions. Fig. 2 is a transverse ver:` tical section taken on the planeof the line w as, Fig. 1. Fig. 3 is a side elevation of a mod! ificationof my said invention. Fig. 4 is a transverse vertical section of thesame taken on the plane of the line y y, Fig. 3. Fig. 5 is also a.

side elevation of a moditication of my said invention.

A designates the back plate of the device,

and it is provided with trunnions a a, which enter eyes or bearing-boxesaflixed tothe wall or other vertical object to which the device is to beattached; and hence the bracket is allowed to be swung around to theright or left, in a well-known manner. supportingarms. These arms arepivoted at their rear ends to the back plate A, and are so constructedand arranged as to overlap each other for a suitable distance of theirlength; and to accomplish this overlapping I preferably increase thewidth of the arms, as shown at b b in the several gures. Each arm isprovided with an arc-shaped slot, c d, (see Figs. l and 5,) cut throughthe said arms where they overlap each other, the curve of the slot c ofthe one arm running in a reverse direction from th at of the slot d ofthe other arm. A binding screw or pin, C, is passed through these slotsfor holding the arms together. In the present instance the head of suchpin is larger across than the width of the slot, so that` it willoverlap and bear upon the outside of the arm, and its other end isprovided with a screw-thread, upon which screws a thumb-nut, in awell-known manner. In Figs. 1 and 3 the back plates are broader than theback plate shown in Fig. 5, and they are provided, near their forwardedges, with a slot, f, running ou the line of the arc of a circle. InFig. l the point or center from which the arc is described lies midwaybetween the two points at which the arms B B are respectively pivoted tothe back plate; but in Fig. 3 the arc is described from a point orcenter occupied by the -rivet `which holds the arm B' to the back plateA; and in Fig. 3 I have shown a modification, which consists inproviding only one of the arms (that lettered B) with a slot, o, thepin,

B B designate the4 being stationary or passing through a simple hole inthe arm B'. In both Figs. l and 3 the pin C passes through the slot f ofthe back plate, and, while this feature in no respect interferes withthe up-and-down or vertical motion of the arms B B', by employing it Iam enabled to produce a much stronger device, because I thus have anadditional support, acting, in fact, as a brace projecting' at somedistance beyond the points where the arms are pivoted to the back plate;and in such cases it will be seen that by tightening the pin or screwG-that is, by screwing its nut up against the opposite side of the slotf--the friction of the parts will be suflicient to cause the arms toremain in either of the two positions shown in Fig. l, or in anyintermediate position, as desired.

Fig. 5 is introduced to show the arrangement of parts when thisincreased width of back plate, which carries the slot f, is not used.Here the arms B B' are caused to remain in any given position by thefriction caused by drawing the arms close together by the pin C passingthrough the slots c d in said arms.

I will here remark that either one of the arms B or B', shown in theseveral figures, may be pivoted on the opposite side-of the back plate,

so that one armsay B-shall be located on the one side and the arm B' onthe opposite side of the back plate; in other respects the -relativeposition of the parts need not be changed. And I will further remarkthat where most strength is required two back plates-one on each side ofthe rear ends of the arms--may be employed, as is obvious.

The forward ends of the supporting-arms B B' are pivoted to ahead-block, D. This headblock is designed to receive a slidingextension-bar, E 5 and in Fig. l this bar passes through loops g gprojecting from the headblock in lines horizontally with each other; butin Figs. 3 and 4 the loops g g project from the head-block in linesvertically with each other; and in this latter case a pin, F, carrying asleeve, F', through which the sliding bar E passes, is inserted throughthe said loops g g and I will remark that when this latter form isadopted, if the pin be round, short arms B B' may be employed and theback plate be stationary, when, as is obvious, the sliding bar E,instead of the bracket, would have the function of being swung aroundhorizontally to the right or left 5 and, besides this, whenever occasionshould require it, the said sliding bar E could be set angularly withrespect to the arms B B', which is a very desirable additional functiongiven to the bracket as a whole. Of course a thumb-screw, m, (see Figs.2 and 4,) or other suitable means, may be employed for holding orlocking the sliding bar E after it hasbeen moved backward or forward therequired distance.

I have shown the said sliding bar so constructed as to answer a doublepurpose. It is made tubular to serve as a reservoir, which may be illed,at h, with oil or spirits for supmages plying a wick, which may bepassed down through a tube, h', at its outer end, or as a means forconveying gas to a burner at h', and the tube h' would, in addition toits being a wick or gas tube, serve as a pivot for steadying a revolvingtray or platform, G, for dentists7 use, as will be understood byreference to Fig. 1, where such platform is illustrated by two sectionalviews taken at right angles to each other. The top of the platformaffords a place upon which the dentist can lay the tools with which hemay be operating, and the drawers 7c 7c provide a convenient place forkeeping the tools and articles which a dentist must necessarily haveclose at hand. The drawers k 7c are preferably arranged so that they canbe pushed out from either one of two of the edges of the platform, aswill be clearly understood by examining the two sectional views of theplatform in Fig. l. Y

If it be not desired to construct the sliding bar E so that it may becaused to serve as a reservoir for an illuminating liquid, it may be asimple tube or a solid bar made of any material possessing the requiredstrength, and in such case a plain pin in place of the tube h' wouldserve as a journal around which to turn the platform G, or as a readymeans for the attachment of a lamp or various other devices.

My invention, hereinabove described, produces a bracket in which greatstrength coupled with lightness is combined; a bracket which isornamental and attractive, cheap to manufacture; one that is easilyadjusted to any required elevation and held securely; one that can beswung to any required position to the right or left; and one which isrendered extensible by the employment of the sliding bar. It will alsobe seen that these brackets are useful for a great variety of purposesother than for dentists use-for instance, as supports for writing-desks,instrument-cases, work-tables, drawing-boards, for displaying textilefabrics and other articles in store windows, te.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, with a swinging or stationary back plate, A, of thesupportingarms ,B B', having one or both of said arms provided with acurved slot, through which is inserted a locking-pin, C, whereby thealtitude of the device carried by the outer ends of the said arms may beregulated as desired, substantially as herein specied.

2. The combination, with the said arms B B', of a stationary or swingingback plate, A, provided with the curved slot f, substantially as and forthe purposes herein specified.

3. The' combination, with the said arms B B', of the sliding bar E,whether tubular or solid, substantially as and for the purpose hereinset forth.

4. The combination of a wick or gas tube, h', with the sliding bar E andsupporting-arms B B', substantially as and for the purpose hereinspecified.

5. The combination of the platform G, hav- 7. The combination, with thearms B B', of ing sliding drawers k, with the sliding bar E, thehead-block D and pin F, whereby the bar arms B B', and back plate A,substantially as E, or the device supported by the pin F, may

herein specified. be revolved or swung around, substantially as 6. Thecombination of the following eleherein specified. ments: The back plateA, either with or With- J AMES B. MORRISON.

out the slot f, the arms B B', one or both of` `which is provided with acurved slot, o or d, a Witnesses: locking-pin, (J, and a sliding bar, E,arranged A. J. DE LACY,

and operating substantially as herein speoi- M. M. LIVINGSTON. fied.

